How Did Traffic Signs Colors And Shapes Become Standardized?

Upload and start working with your PDF documents.
No downloads required

How To Blackout PDF Online?

Upload & Edit Your PDF Document
Save, Download, Print, and Share
Sign & Make It Legally Binding

Easy-to-use PDF software

review-platform review-platform review-platform review-platform review-platform

How did traffic signs colors and shapes become standardized?

Without googling it. Red likely because in itself it means stop or danger or something to grab you attention. Like, when you get an “F” in school or a check mark, it is usually in red. Green because it usually indicates the GO ahead, as in language, you’ve got the green light to go ahead. Yellow, who knows, problems because it is in the middle interns of what it implies, not danger, of moving forward but calm but with caution. Just like when you wear clothes, yellow is sort of in the middle of the road so to speak.

PDF documents can be cumbersome to edit, especially when you need to change the text or sign a form. However, working with PDFs is made beyond-easy and highly productive with the right tool.

How to Blackout PDF with minimal effort on your side:

  1. Add the document you want to edit — choose any convenient way to do so.
  2. Type, replace, or delete text anywhere in your PDF.
  3. Improve your text’s clarity by annotating it: add sticky notes, comments, or text blogs; black out or highlight the text.
  4. Add fillable fields (name, date, signature, formulas, etc.) to collect information or signatures from the receiving parties quickly.
  5. Assign each field to a specific recipient and set the filling order as you Blackout PDF.
  6. Prevent third parties from claiming credit for your document by adding a watermark.
  7. Password-protect your PDF with sensitive information.
  8. Notarize documents online or submit your reports.
  9. Save the completed document in any format you need.

The solution offers a vast space for experiments. Give it a try now and see for yourself. Blackout PDF with ease and take advantage of the whole suite of editing features.

Customers love our service for intuitive functionality



46 votes

Blackout PDF: All You Need to Know

Yellow. This one is probably my favorite as it is for safety, to slow down and to make sure you don't hit a pedestrian or other person on the street.